Click tag button superceded by a rollover button

Hi working on HTML5 canvass's - creating standard digital display ads with a clickable click tag button. All perfect until I added another button above it (layer) with a rollover 'hover, click etc…' to fit the Brand but because it's above the click tag button it's not clickable or connected to click tag (get it?).

If I place under click tag the rollover then doesn't work but the whole ad is clickable and the click tag code is OK. 

Adding 'Click to Go to Web Page' to the button just throws another URL into the mix and I think will affect the click tag tracking (however is sort of works). Ideas?